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24. CO2 Induces Symmetry Breaking in Layered Dipeptide Crystals.

Author

Li, Xianbao, Li, Qi, Wu, Aoli, and Li, Junbai

Subjects
SYMMETRY breaking, DIPEPTIDES, CRYSTALS, PIEZOELECTRICITY, STRUCTURAL engineering
Abstract

Control of symmetry breaking of materials provides large opportunities to regulate their properties and functions. Herein, we report breaking the symmetry of layered dipeptide crystals by utilizing CO2 to induce the adjacent monomolecular layers to stack from the opposite to the same direction. The role of CO2 is to cover the interlayer interaction sites and force the dipeptides to adsorb at asymmetric positions. Further, the dipeptide crystals exhibit far superior piezoelectricity after symmetry breaking and the piezoelectric voltage generated from the dipeptide‐based generators becomes more than 500 % higher than before. This work reveals a potential route to engineer structures and properties of layered materials and provides a deep insight into the control of non‐covalent interactions. [ABSTRACT FROM AUTHOR]

Published
2023
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27. Force‐Induced Molecular Isomerization for the Construction of Multicolor Luminescent Segmented Molecular Crystals.

Author

Guo, Yongxian, Wu, Aoli, Qiu, Changkun, Ge, Fayuan, Jiang, Yifei, Gong, Yanjun, and Hu, Qiongzheng

Subjects
*MOLECULAR crystals, *ISOMERIZATION, *ATOMIC force microscopes, *SINGLE crystals, *MOLECULAR conformation, *INTERMOLECULAR interactions
Abstract

Multicolor luminescent segmented materials have attracted tremendous research interest due to their potential applications as barcoding materials in information security and anti‐counterfeiting. Although much effort has been devoted to the preparation of photonic barcodes based on different light‐emitting materials, the rational design of barcoding materials with well‐controlled emission color and length at desired position remains a challenge. Here, a novel strategy to fabricate multicolor luminescent segmented 1D molecular crystals is reported by manipulating the molecular conformation and intermolecular interactions of the mechanochromic crystals, which are assembled from a rationally designed twisting conjugated molecule. The emission color of these mechanochromic crystals changes from green to orange with the mechanism of synergy effect of force‐induced molecular isomerization from trans to cis state and molecular packing changes from cross to parallel, which is revealed by single crystal X‐ray diffraction. Multicolor luminescent segmented 1D microribbons are fabricated by applying precisely controlled forces by tapping mode atomic force microscope, which shows the encoding capability. These findings provide a new method that allows the controllable fabrication of segmented materials with tunable emission color and length at desired position toward barcoding applications. [ABSTRACT FROM AUTHOR]

Published
2022
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34. Co‐assembled Supramolecular Gel of Dipeptide and Pyridine Derivatives with Controlled Chirality.

Author

Wu, Aoli, Guo, Yongxian, Li, Xianbao, Xue, Huimin, Fei, Jinbo, and Li, Junbai

Subjects
*PYRIDINE derivatives, *CHIRALITY, *NEUROLOGICAL disorders, *DIPEPTIDES
Abstract

It is commonly considered that amyloid‐β (Aβ) fibrils are heavily involved in the neurological diseases. Establishing an external model based on the core recognition motif (diphenylalanine, FF) of Aβ would be of significance in understanding the assembly and disassembly of Aβ fibrils in living system. Herein, supramolecular gels with structure transition from amyloid‐like β‐sheet to different supramolecular helices were obtained through the co‐assembly of a N‐fluorenylmethoxycarbonyl‐protected L‐FF (L‐FmocFF) with achiral pyridine derivatives. It is found that the different stacking modes (H‐ or J‐aggregates) of additives and the microenvironment of chiral carbon play vital roles for the selectively chiral transfer or amplification of L‐FmocFF. The dynamic process of helix formation was also captured. This work provides a convenient co‐assembly way to explore the structure basis of Aβ fibrils with a controlled chirality. [ABSTRACT FROM AUTHOR]

Published
2021
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